Even more informative error message

[veloman-yunkan]

The previous PR (#667) was merged before I could improve it. Hence another small PR.

[kelson42]

@veloman-yunkan Sorry for merging to quickly. Good in the principle, but it seems that too many CI are faling (beside the usual macOS ones)!

[veloman-yunkan]

@veloman-yunkan Sorry for merging to quickly. Good in the principle, but it seems that too many CI are faling (beside the usual macOS ones)!

Indeed. I lost one change (an #include) when moving the extra fix to a new PR. Now the CI should fail in an expected way.

[codecov]

Codecov Report

Merging #668 (3776b66) into master (71d25f9) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master     #668   +/-   ##
=======================================
  Coverage   84.77%   84.78%           
=======================================
  Files          98       98           
  Lines        4224     4225    +1     
  Branches     1889     1890    +1     
=======================================
+ Hits         3581     3582    +1     
- Misses        641      642    +1     
+ Partials        2        1    -1     

Impacted Files	Coverage Δ
src/fs_unix.cpp	94.23% <100.00%> (+0.11%)	⬆️
src/version.cpp	0.00% <0.00%> (ø)

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